Trivia

Spoilers

The trivia items below may give away important plot points.

Time dilation where one outside day equals six years of dome time is a greater than 1:2000 dilation. That means that visible light ( in the area of 500 nm) entering the dome would be red-shifted into radio waves. The only 'visible light' that would come from the sun would start as x-ray radiation and ,upon entering the dome, be red- shifted into the visible spectrum.